Finance Minister Naoto Kan is expected to win vote in upper house of parliament

Yukio Hatoyama announced his resignation Wednesday

Kan has some popularity with public because of his work as health minister

Tokyo, Japan (CNN) -- The lower house of Japan's parliament elected Finance Minister Naoto Kan to be the nation's new prime minister Friday, following the resignation of Yukio Hatoyama from the post earlier this week.

The upper house of the Diet, Japan's parliament, was expected to confirm Kan as prime minister in a vote scheduled later Friday.

The vote came a few hours after the Democratic Party of Japan tapped Kan to lead the party.

"The very first thing we must do is to regain the trust of the people," Kan said in a speech to party members before their vote Friday.

"I have confidence that economic growth and social welfare can be realized together," he said.

Hatoyama, who announced his resignation Wednesday during a live broadcast of an address to party members, watched from the audience as Kan spoke.

"I have had many shortcomings, I have been allowed to lead all of you for the past eight months to today. I am extremely grateful for having been given this opportunity," Hatoyama said during his resignation speech.

In addition to serving as finance minister in the Hatoyama administration, Kan served as deputy prime minister. But Kan will be a rare political breed for a Japanese premier: His family has not produced another prime minister or state minister, which could play well with a Japanese public that has seen several sons and grandsons of former ministers in the past year ascending to the premiership only to step down again a few months later.

As a former health minister, Kan gained popularity with voters after exposing a government cover-up of HIV-tainted blood products that caused thousands of hemophilia patients to contract the virus that causes AIDS. As a state minister for economy, he was not shy to talk about the foreign currency exchange rate. In January, he was supportive of a weaker yen to help the export-driven Japanese economy.

Eight months ago, Hatoyama 's Democratic Party of Japan won a sweeping victory, an outcome hailed by many as a revolution in Japanese politics. With promises of a cleaner government, Hatoyama worked to shift the political dynamics in Japan by taking away power from the bureaucrats and granting more power to politicians and local governments.

But allegations of illegal campaign financing soon tarnished his administration's image. Some of his cabinet members were investigated for corruption.

His approval rating took further hits over his failed promise to move a major U.S. Marine base off Okinawa to ease the burden of the island, which hosts the majority of the United States military presence in Japan. Earlier this month, calling his decision "heartbreaking," he announced that the base would remain on Okinawa, although relocated to a different part of the island.

Hatoyama's critics claimed he gave in to U.S. pressure, and his government coalition broke up.